id say gray, though i love both-i have gray Longarm with the Autobots, and purple Shockwave with my Decepticons.

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That's how I have mine too!

As for the topic: GET BOTH! So you can have it like Torque and I do. Shockwave is awesome, so why not have all of him?

Seriously though, the Purple version has a bunch of quality control issues like bad paint and loose/broken joints. So if you are going to be playing with it a lot, go for this one. If you are going to pose it, go with the Grey.